In St. Clair County there are 4 residential DSL providers covering 79.15% of the county. The average home can get speeds up to 65 Mbps. Note that we may have a financial relationship with some of the providers below. This does not influence rankings, and helps us provide high-quality detailed information for free.
This page contains all DSL internet providers in St. Clair County, IL.
To see availability maps for all providers including fiber, cable, DSL, and more in St. Clair County, IL please click below.
St. Clair County, IL Availability Maps
DSL Internet Service Providers in St. Clair County
Data updated 11/14/2025, based on FCC data from 12/31/2024. This is the most current data available as of .
To avoid wasting your time, providers with less than 1% coverage in St. Clair County are not shown.
St. Clair County Satellite TV & Internet Providers
DISH Satellite TV
DIRECTV Satellite TV
Not sure whether to choose Dish or DIRECTV? For most people most of the time we recommend DISH. But click here to learn more.
Viasat Satellite Internet
Where in St. Clair County is DSL internet available?
DSL Internet Availability Key
DSL is available in 79.15% of St. Clair County. Areas in green have DSL internet service, where areas in yellow or red may not. The most widely available provider is AT&T. Call one of the companies with service in St. Clair County above to see who has service at your home.
How fast is DSL internet in St. Clair County?
The map below shows maximum DSL internet speeds by area in St. Clair County.
DSL Internet Speed Key
The average St. Clair County home can get up to 65 Mbps on their DSL internet plan. The fastest DSL download speed in the county is 115 Mbps, which less than 1% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 19.09% of homes can only purchase plans up to 10 Mbps. See the internet provider details below for info about their speed and coverage in St. Clair County.
DSL internet speeds tend to be faster in the central parts of St. Clair County, and slower in the southeast areas of the county.
Is DSL the fastest internet I can get in St. Clair County?
The fastest internet for you may vary based on where in St. Clair County you live. In general, cable competes most often with DSL in the county.
- Fiber is the fastest internet type for 38.70% of St. Clair County homes.
- Cable is fastest for 54.88% of the county.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for 4.11%.
- Satellite internet may be the only option for 1.59% of St. Clair County homes.
DSL Providers in Depth
Below you'll find which TV and internet providers offer service in St. Clair County, along with details on where in St. Clair County and at what speeds.
AT&T DSL in St. Clair County, IL
AT&T DSL coverage
About 71.94%, or 185,174 people, have AT&T DSL internet available to them in the county. The company covers the entire St. Clair County area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in much of St. Clair County.
AT&T DSL download speeds
AT&T is below average when comparing download speeds to all other internet providers in St. Clair County. Versus other DSL providers in the area, AT&T DSL is average. There are 5 different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from AT&T goes up to 100 Mbps, the slowest package only goes up to 10 Mbps, and the county-wide average maximum speed for St. Clair County customers is up to 66 Mbps.
Show all download speeds
- 46.7% up to 100.0 Mbps
- 10.5% up to 75.0 Mbps
- 16.3% up to 50.0 Mbps
- 5.1% up to 25.0 Mbps
- 21.3% up to 10.0 Mbps
AT&T DSL upload speeds
In St. Clair County download speeds tend to be faster than than upload speeds for AT&T DSL. Compared to other ISPs, AT&T is below average where upload speeds are concerned, and above average compared to other St. Clair County DSL providers. AT&T offers 4 different upload speeds across the county, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in St. Clair County is up to 20 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, AT&T customers can get speeds up to 14 Mbps.
Show all upload speeds
- 57.3% up to 20.0 Mbps
- 16.3% up to 10.0 Mbps
- 5.1% up to 5.0 Mbps
- 21.3% up to 1.0 Mbps
EarthLink DSL in St. Clair County, IL
EarthLink DSL coverage
About 71.94%, or 185,174 people, have EarthLink DSL internet available to them in the county. The company covers the entire St. Clair County area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in much of St. Clair County.
EarthLink DSL download speeds
EarthLink is below average when comparing download speeds to all other internet providers in St. Clair County. Versus other DSL providers in the area, EarthLink DSL is average. There are 5 different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from EarthLink goes up to 100 Mbps, the slowest package only goes up to 10 Mbps, and the county-wide average maximum speed for St. Clair County customers is up to 66 Mbps.
Show all download speeds
- 46.7% up to 100.0 Mbps
- 10.5% up to 75.0 Mbps
- 16.3% up to 50.0 Mbps
- 5.1% up to 25.0 Mbps
- 21.3% up to 10.0 Mbps
EarthLink DSL upload speeds
In St. Clair County download speeds tend to be faster than than upload speeds for EarthLink DSL. Compared to other ISPs, EarthLink is below average where upload speeds are concerned, and above average compared to other St. Clair County DSL providers. EarthLink offers 4 different upload speeds across the county, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in St. Clair County is up to 20 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, EarthLink customers can get speeds up to 14 Mbps.
Show all upload speeds
- 57.3% up to 20.0 Mbps
- 16.3% up to 10.0 Mbps
- 5.1% up to 5.0 Mbps
- 21.3% up to 1.0 Mbps
Frontier Communications DSL in St. Clair County, IL
Frontier DSL coverage
About 5.11%, or 13,143 people, have Frontier DSL internet available to them in the county. The company covers the southeast, southwest, south, west, northeast, and east St. Clair County area. Frontier is one of the largest internet service providers internet service providers in the US, with internet service available in a very small piece of St. Clair County.
Frontier Communications DSL download speeds
Frontier is the slowest when comparing download speeds to all other internet providers in St. Clair County. Versus other DSL providers in the area, Frontier DSL is the slowest. There are 5 different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from Frontier goes up to 115 Mbps, the slowest package only goes up to 10 Mbps, and the county-wide average maximum speed for St. Clair County customers is up to 28 Mbps.
Show all download speeds
- 9.5% up to 115.0 Mbps
- 6.4% up to 90.0 Mbps
- 3.5% up to 70.0 Mbps
- 3.5% up to 45.0 Mbps
- 77.0% up to 10.0 Mbps
Frontier Communications DSL upload speeds
In St. Clair County download speeds tend to be faster than than upload speeds for Frontier DSL. Compared to other ISPs, Frontier is the slowest where upload speeds are concerned, and the slowest compared to other St. Clair County DSL providers. Frontier offers 4 different upload speeds across the county, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in St. Clair County is up to 7.0 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, Frontier customers can get speeds up to 2.0 Mbps.
Show all upload speeds
- 9.5% up to 7.0 Mbps
- 6.4% up to 5.0 Mbps
- 7.0% up to 3.0 Mbps
- 77.0% up to 1.0 Mbps
Harrisonville Telephone Company DSL in St. Clair County, IL
HTC DSL coverage
About 2.62%, or 6,745 people, have HTC DSL internet available to them in the county. The company covers the west and southwest St. Clair County area. HTC is a large internet service provider internet service providers in the US, with internet service available in a very small piece of St. Clair County.
Harrisonville Telephone Company DSL download speeds
HTC is below average when comparing download speeds to all other internet providers in St. Clair County. Versus other DSL providers in the area, HTC DSL is the fastest. There are 4 different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from HTC goes up to 100 Mbps, the slowest package only goes up to 10 Mbps, and the county-wide average maximum speed for St. Clair County customers is up to 86 Mbps.
Show all download speeds
- 75.5% up to 100.0 Mbps
- 16.8% up to 50.0 Mbps
- 6.1% up to 30.0 Mbps
- 1.5% up to 10.0 Mbps
Harrisonville Telephone Company DSL upload speeds
In St. Clair County download speeds tend to be faster than than upload speeds for HTC DSL. Compared to other ISPs, HTC is below average where upload speeds are concerned, and the fastest compared to other St. Clair County DSL providers. HTC offers 4 different upload speeds across the county, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in St. Clair County is up to 20 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, HTC customers can get speeds up to 17 Mbps.
Show all upload speeds
- 75.5% up to 20.0 Mbps
- 16.8% up to 10.0 Mbps
- 6.1% up to 3.0 Mbps
- 1.5% up to 1.0 Mbps
St. Clair County DSL by Area
This information is most helpful to those looking for homes or considering moving to St. Clair County or any of the areas nearby.
How does DSL internet in St. Clair County compare to the rest of Illinois?
DSL internet speeds in St. Clair County are much faster versus the average speeds in Illinois: 0.00 Mbps in Illinois versus 65 Mbps in the county. The state has similar DSL availability compared to the county. Average DSL coverage in Illinois is 0.00% versus 79.15% in St. Clair County.
What zip codes have DSL internet?
DSL internet coverage varies by zip code and neighborhood. Some examples in or around St. Clair County are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does DSL internet look like in other counties?
Below are counties nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Counties
- St. Louis City, MO: more DSL coverage, slower speeds
- St. Louis County, MO: more DSL coverage, faster speeds
- Clinton County, IL: less DSL coverage, slower speeds
- Marion County, IL: less DSL coverage, slower speeds
- Franklin County, MO: less DSL coverage, slower speeds
- Gasconade County, MO: less DSL coverage, slower speeds
- Wayne County, IL: less DSL coverage, slower speeds
- Osage County, MO: less DSL coverage, slower speeds
- Edwards County, IL: less DSL coverage, slower speeds
- Wabash County, IL: less DSL coverage, slower speeds
Counties with Similar Populations
- Horry County, SC: less DSL coverage, slower speeds
- Richmond County, GA: less DSL coverage, slower speeds
- Racine County, WI: more DSL coverage, faster speeds
- Onslow County, NC: less DSL coverage, slower speeds
- Okaloosa County, FL: more DSL coverage, slower speeds
- Niagara County, NY: less DSL coverage, slower speeds
- New Hanover County, NC: less DSL coverage, slower speeds
- Muscogee County, GA: less DSL coverage, slower speeds
- Leon County, FL: more DSL coverage, faster speeds
- Kalamazoo County, MI: more DSL coverage, faster speeds